Improvement in carriage-jacks



' '2 Sheets-Sheen. 1 C. DUECKER.

CARRIAGE-JACK.

No. 191,410. Patented May 29,1877.

WITNESSES ATTORNEY WITNESSES 2 Sheets-Sheet 2. C. DUEOKER.

CARRIAGE-JACK.

Patented May 29,1877.

ATTORNEY;

UNITED. J S T S CONRAD DUEGKER, or TAMABOA, ILLINOIS, ASSIGNOR TO 0 GRAY AND ALBERT B. BOWMAN.

PATENT 1 OFFICE.

IMPROVEMENT IN CARRlAGE-JACKS. I

, Specification forming part of Letters Patent No. 191,410, dated May 29, 1877 November 11, 1876. I I I To all whom it may concern: I

Be it known that 'I,'G0NI AD DUEGKER, of Tamaroa, in the county of Perry and State of Illinois, have invented a new and valuable Improvement in Railroad and Carriage Jacks and I do hereby declare that the following is afull, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings, making a part of this specification, and to the letters and figures of reference marked thereon.

Figure 1 of the drawings is a representation of a longitudinal section of my improved jack. Fig. 2 is a top view of the operatingwheel, with the main shaft in cross-section and the lever in position. Figs. 3, 4, and 6 are detail views, and Fig. 5 is a longitudinal vertical section of the jack, showing a gearwheel motor applied.

This invention has relation to improvements in jacks for raising vehicles, houses, and other heavy bodies; and the natureof the invention consists in a main shaft, which is screwthreaded to the right at its upper end and to the left at its lower end, in combination with a correspondinglythreaded base and head for the reception, respectively, of the lower and upper ends-of the said rod, and a mechanism for rotating the said shaft, whereby the latter will be extended from the base, and will extend the cap or head, thus accelerating the raising of the body, all as hereinafter shown and described.

In the annexed drawings, the letter A designates the main shaft of my improved liftingjack, B the base, and G a preferably-removable cap or head. Shaft A will be oppositely screw-threaded at each end, the lower end being left screw-threaded and the upper right, or the reverse.

Base B will be provided with an upright metallic socket, B, having a female screwthreaded bore, adapted to receive the left thread a, on the lower end of the main shaft; but both the base and socket may be cast in one piece, if 1 so elect.

The cap or head 0 will also be screw-threaded, and will receive the right thread a on the upper end of the said main shaft. It will be evident that if the implement be placed under application filed v a movable body, and rotation be given to the main shaft, the latter will be extended, and will extend the capping or head 0, thus producing a double action, which will raise the body operated on with great speed, so long as both the base and cap are stationarythat is,"non-rotating. Rotary motion will be imparted to the main shaft through the medium of a wheel, D, keyed or otherwise secured thereon. This wheel will have spaced upwardly-projecting spurs b on its upper edge,

near its perimeter, and the hub will have a cylindrical extension, 0, terminating at its upper edge in a flange, d, which will form, with the body of the wheel D, an annular groove, 0, so that the wheel may be operated by hand, or, when an unusually heavy bodyis to be raised, by a hooked lever, E. This lever will engage, by means of its hook I, with extension 0 of the hub, the flange (1 serving to prevent its casual detachment therefrom, and will project considerably beyondthe wheel. It will have its fulcrum on one of spurs b, and, when actuated, will rotate the shaft, with the result aforesaid, to some extent. It will then be shifted to the next spur b, and the intermittent rotation of the shaft continued until the object has been sufficiently raised. By reversing the direction of rotation of the main shaft the latter will be drawn down into its base, and screwed up into its cap or head simultaneously, thus lowering the object raised very expeditiously. In lieu of the hand-wheel D I may sometimes, where a steady, uninterrupted rotation of the main shaft is desirable, use the following:

A beveled gear-wheel, L, will be secured against rotation on the shaft A, as shown in the drawings, or by other suitable means, with which a gear-wheel, F, having a crankarm, G, will engage. This latter wheel will have its bearings on a spindle, d, projecting out at right angles from the body of a sleeve, H, loosely applied upon the main shaft aforesaid, above gear L. This sleeve will have a vertical offset, 0, to which a rigid metallic rod, I, will be secured. This rod extends up through an ofl'set,f, formed at the lower end of the cap or head 0, so that, while the head and sleeve are held in a rigid relation to each ARROLL E.

raised, against rotation, it will, through rod I,

hold the sleeve in a like fixed position, and

by actuating the gear-wheel F the main shaft 7 will be extended from its base, and will raise its cap, or the reverse, according to the direction of rotation given to thesaid gear. Heads 0 will be of various descriptions, accordin gto the nature of the work. Forinstance, in raising car-bodies and buildings upon which a flat bearing can be had, I-shalluse themcon-structed with a flat upper face but, in raising-axles and other shaftings, I shall remove the cap above described, and substitute one of those head, 43.

shown in Figs. 6 and 4, having a concave What =1 claim "as new, and desire to secure by Letters P-atent, is-

The combination, with the shaft A, having oppositely-threaded ends a a, the base B, and cap 0, receiving respectively the lower and upper ends of the said shaft, of the wheel D,

having g ve, 0, annularly formed in "its hub and "the Spaced purs 1) upon its perimeter, substantially as specified.

In testimony that I claim the above I have hereunto subscribed my name in the presence of two witnesses.

CONRAD DUE'GKER.

Witnesses 0. Z. PYLE, T. 1?. BERRYfiILL. 

